package com.jiashihui.web.interceptor;

import com.alibaba.fastjson.JSON;
import com.jiashihui.web.annotation.AccessLimit;
import com.jiashihui.web.model.base.BaseResponse;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;

/**
 * @author jiashihui
 * @describe: 防刷拦截器
 * @date 2019/03/20
 */
public class FangshuaInterceptor extends HandlerInterceptorAdapter {

//    @Autowired
//    private RedisService redisService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断请求是否属于方法的请求
        if (handler instanceof HandlerMethod){
            HandlerMethod hm = (HandlerMethod) handler;
            //获取方法中的注解,看是否有该注解
            AccessLimit accessLimit = hm.getMethodAnnotation(AccessLimit.class);
            if (accessLimit == null){
                return true;
            }
            int seconds = accessLimit.seconds();
            int maxCount = accessLimit.maxCount();
            boolean login = accessLimit.needLogin();
            String key = request.getRequestURI();
            //如果需要登录
            if (login){
                //获取登录的session进行判断
                key += "" + "1";
                //这里假设用户是1,项目中是动态获取的userId
            }
            //从redis中获取用户访问的次数
//            AccessKey ak = AccessKey.withExpire(seconds);
//            Integer count = redisService.get(ak, key, Integer.class);
            Integer count = 3;
            if (count == null){
                //第一次访问
                //redisService.set(ak, key, 1);
            } else if (count < maxCount){
                //加1
                //redisService.incr(ak, key);
            } else {
                //超出访问次数
                BaseResponse rs = new BaseResponse();
                render(response, rs);
                //这里的CodeMsg是一个返回参数
                return false;
            }
        }
        return true;
    }

    private void render(HttpServletResponse response, BaseResponse rs) throws Exception {
        response.setContentType("application/json;charset=UTF-8");
        OutputStream out = response.getOutputStream();
        String str = JSON.toJSONString("{\"code\" : \"-01225\"}");
        out.write(str.getBytes("UTF-8"));
        out.flush();
        out.close();
    }

}
